Instructions for the installer
67
3.17 Filling the system
Once all boiler connections have been completed, CH system can be filled.
The procedure is to be cautiously carried out, following each step:
• Open the bleeding valves on all radiators and verify the boiler automatic valve operation.
•
Gradually open specific filling cock (see
Fig. 2 Filler cocks) or the cock on the cold water supply pipe for KR/KRB model), checking
any automatic bleeding valves installed in the system work properly.
• Close all radiator bleeding valves as soon as water starts coming out.
• Check on pressure gauge that water pressure reaches the 1÷1.3 bar reading.
• Check on boiler display that water pressure reaches the 1÷1.3 bar reading.
•
Shut the filler cock and bleed any air out again, by opening the air bleeding valves on radiators.
• Start the boiler and bring the system to working temperature, stop the pump, and repeat air bleeding procedure.
• Allow the system to cool and restore water pressure to 1÷1.3 bars.
WARNING
Pressure sensor will not electrically enable the burner ignition when water pressure is below 0.4 bar (this parameter can
be edited by qualified professional staff).
Water pressure in the CH system must not be lower than 1 bar. In case it is not so, fill the system with water (see
Shut-down
due to low water pressure on page
25
).
The procedure is to be followed while the system is cold.
Digital pressure gauge is used to read pressure inside the heating circuit.
WARNING
As for water treating in the domestic heating systems in order to optimise efficiency and safety, ensure a long life, trouble-
free operation of auxiliary equipment, minimise power consumption, thereby integrating the standards and rules in force
in the country of installation, it is recommended to use specific products suitable for multi-metal heating systems.
3.18 Starting up the boiler
3.18.1 Preliminary checks
Before starting the boiler, check that:
•
The flue gas venting duct and the relevant terminal are installed in conformity with the instructions: with the boiler operating, there
must be no leakage of combustion by-products from any of the gaskets.
• The supply power to the boiler must be 230 V ~ 50 Hz.
•
The heating system is correctly filled with water (pressure gauge reading 1÷1.3 bar).
• Any shut-off cocks in the system pipes are open.
• The mains gas type is correct for the boiler calibration: convert the boiler to the available gas if necessary (see Adaptation to other
gas types and burner adjustment on page
83
). This operation is to be exclusively carried out by qualified personnel.
• The gas supply cock is open.
• There are no fuel gas leaks.
• The main switch installed adjacent to the boiler is turned on.
• The safety valve is not blocked.
• There are no water leaks.
• The condensate trap installed on the boiler is discharging condensate correctly and is not stuck.
3.18.2 Switching on and switching off
To switch the boiler on and off, refer to the “Instructions for the User” (see Instructions for the user on page
11
).